- static void add_staff_sided (Grob*, Item*);
- DECLARE_SCHEME_CALLBACK (before_line_breaking, (SCM ));
- static bool has_interface (Grob*);
+ static void add_side_positioned (Grob *, Grob *);
+ DECLARE_SCHEME_CALLBACK (before_line_breaking, (SCM));
+ DECLARE_SCHEME_CALLBACK (row_before_line_breaking, (SCM));
+ DECLARE_GROB_INTERFACE();
+ static void order_grobs (vector<Grob*> grobs);